algae, water living organisms, bay, large mouth of a river, biome, a complex community with plants, animals, and climate, coral reefs, ridges of rocks hardened animal skeletons near the surface of the water, erodes, wears away from water or wind, gills, how marine animals breathe, tide, the rise and fall of ocean waters, tentacles, flexible limbs used for feeling, grasping, and movement, prey, something that is hunted, species, group of living things with common characteristics.

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